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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5313a6773fa29b9fa771a3c67e55d3ecfa57d37f5a88e4070bc50ecc50627b8' 
  AND token = 'VX9AQt93QlSja7wx3itEPeYIdlnRkFVUlJptp3EStkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}